<script>
    //对象
    const obj = { a: '123', b: 'qwe' }
    const qq = JSON.stringify(obj);
    console.log(qq);
    const json = '{ "a": "123", "b": "qwe" }'
    const ww = JSON.parse(json);
    console.log(ww);
    console.log(ww.a)
</script>